Grainton Ltd has increased its holding in specialist leather makers Pittards Plc with the acquisition of a further 275,000 25 pence ordinary shares in the company. A statement from the Regulatory News Service revealed that Grainton had upped its total shareholding in the company to 4,580,000 shares or 21.01 per cent of the issued ordinary share capital, an increase from its previous 19.75 per cent holding.